Drilling-machine.



PATENTED MAY 15,1906. A. WALKER.

DRILLING- MAOHINE.

APPLIGATION FILED JUNE 9, 1905,

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CHEER, .IOWA, ASSIGNOR TO WHAT CHEER TOOL COMPANY, OF WHAT CHEER, IOl/VA, A CORPORATION ALEXANDER WALKER, OF WHAT OF IOWA.

DRILLING-"MACHINE.

Specification. of Letters Patent.

Patented May 1 5, 1906.

To aZZ whom it may concern:

Be it known that I, ALEXANDER WALKER, a citizen of the United States, residing at What Cheer, in the county of Keokuk and State of Iowa, have invented new and useful Improvements in Drilling-Maclunes, of which the following is a specification.

This invention relates to drilling-machines.

While I do not limit the use of the invention to any particular field, it is of especial utility in connection with mining-work.

One of the features of novelty of the invention is the way in which the crank, which is the prime factor for actuating the drill, is held in position.

Another feature of the invention is an advantageous manner of retaining the bevelpinion common in drilling-machines in position and in such a way that I can compensate for wear of the hub of said bevel-pinion.

Another object of the invention is the provision for the reversibility of the thread-rod which carries the drill in such a way that it is not necessary to take the large gear ordinarily carried by said thread-rod therefrom. By this means a miner can change his drill on different ribs of the face of the coal in an expeditious simple way.

The invention includes other objects and advantages which, with the foregoing, will be set forth in the following description, while the novelty of the invention will be covered in the claims succeeding said description.

In the drawings accompanying and forming a part of this specification I illustrate one simple form of embodiment of the invention which to enable those skilled in the art to practice such invention I will describe in detail in the description alluded to.

In said drawings, Figure 1 is a longitudinal sectional elevation of a drilling-machine including my invention. Fig. 2 is a transverse sectional elevation on the line 2 2 of Fig. 1. Fig. 3 is a side elevation.

Like characters refer to like parts throughout the several figures of the drawings.

In the drawings I have shown a divided or split boxing 2, which when the drilling-ma chine is used in coal-mining and similar operations is connected with a grip-bar, which, however, I do not show, as it is not necessary to a full understanding of the invention. This boxing has its sections hingedly connected, and they are locked or held closed in a positive manner by a pin 3 and connected by a chain or in some other permanent manner with one of the sections of the boxing. The boxing, as is customary, is internally threaded, the threaded surface engaging the externally-threaded surface of the rod 4, provided at one end with the customary socket. The boxing 2 is, as usual, stationary, and it therefore follows that when the thread-rod 4 is turned it will be moved forward or backward in accordance with the direction it is turned.

Non-rotatively connected with the threaded rod. is a bevel-gear 5 of integral structure and of duplex form in that it has upon its opposite faces bevel-teeth in order to render the drill-rod and bevel-gear carried thereby reversible without separating the said gearfrom the throad-rod. In one case one set-of teeth of the gear will mesh with the pinion, while in the other case the other set of teeth of the gear will mesh with such pinion, such as 6. The bevel-gear 5 is splined to or feathered upon the thread-rod, the bevel-gear having interiorly two splines or feathers (each denoted by 7) diametrically opposite and arranged to fit longitudinal,keyways or channels 7 diametrically opposite in the threaded rod 4. It therefore follows that when the gear 5 is held against movement with respect to the boxing or nut 2 and rotated a rotation of the thread-rod will follow, and the threads of said rod being in engagement with those in the boxing the rod will be moved either forward or backward, depending upon the direction of movement of said gear.

The opposite ends of the hub of the bevelgear are expanded or enlarged 'to produce heads integral with the hub, and each desig nated by 8, to revolubly fit in a channel 8" in the boxing, by means of which when the boxing is closed the gear when turned cannot be moved longitudinally of the threadrod. By opening the boxing the threaded rod and gear can be reversed to meet the condition hereinbefore pointed out without taking the gear from the said threaded rod. The heads 8 are of duplicate formation, as will be evident, alternately fitting in the annular channel in the split boxing.

I have briefly mentioned the fact that the bevel-gear 5 meshes with a bevel-pinion 6. Such bevel-pinion is rotatively carried upon a stub-shaft 9, extending outward and ordinarily, though not necessarily, made integral with one of the sections of the divided boxing. The hub of the bevel pinion is elongated in an outward direction and is made to extend outward beyond the stubshaft upon which it rotates, so that, as will now appear, I provide for a taking up of wear in said hub.

I hold the bevel-gear in position in the present case by what I will term a button, as 10, carried by the stub-shaft 9 in such manner that the said button can be moved inward to cause it to engage the outer side of the hub of the said pinion. The button is shown as having an inwardly-extended stem longitudinally adjustable with respect to the said stub-shaft and which is illustrated as externally threaded to fit corresponding threads within a socket in the outer end of said stubshaft. The stem 11 is fitted into the socket and run thereinto until the button abuts against the hub of the bevel-pinion 6. As the outer surface of the hub wears away the stem can be run farther inward into its socket in order to cause the button at all times to solidly engage the said hub and naturally take up wear and prevent chattering. The button of course may be of any sha e, although it is represented as being of disk form and as having a polygonal portion which can be engaged by a wrench.

The crank for operating the bevel-pinion and necessarily through the intermediate parts the threaded rod is designated by 12, and it has an opening between its ends to receive the hub of the bevel-pinion. To nonrotatively connect the hub and crank, I show the hub as having a key or fin 13, which tapers outwardly and which is adapted to fit within a correspondingly-shaped seat in the hub-opening of the crank. To prevent the crank from being displaced, Iprovide a pin, as 14, shown as being of split resilient form or of the cotter type, which pin is adapted to be projected through registering openings in the crank 12 and key 13, respectively. By taking out the pin the crank can be readily slipped from the hub of the bevel-pinion. As will be understood, I can readily drill a hole in the crank and through the hub of the wheel in such a way as to hold the crank securely in position Without interfering with the shaft which carries the bevel-pinion or the boxing from which said shaft extends. The openings in the crank and key through which the holding-pin 14 is passed are formed straight through the two parts.

Having thus described my invention, what I claim is- 1. In a drilling-machine, the combination of internally-threaded boxing, a threaded-rod extending'through, and the threads of which engage those of, the boxing, a bevel-gear splined on the rod and having expanded heads and bevel-teeth on opposite sidesthereof, the boxing having a channel to receive either of the heads, and a second bevel-gear to mesh with either set of teeth on the first bevel-gear.

2. In a drilling-machine, the combination of an internally-threaded boxing, a threaded rod extending therethrough, the threads of the two parts engaging each other, a bevelgear splined on the rod and having expanded heads integral with the hub thereof, bevelteeth upon opposite sides thereof, the boxing having a channel to receive either of the heads, a second bevel-gear to mesh with either set of teeth on the first bevel-gear, the boxing being provided with a shaft to carry said second bevel-gear, and a hand-crank mounted on the second bevel-gear for turning the same.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WM. E. WALKER, H. R. REID. 

